Continuous variable valve timing apparatus and engine provided with the same

Abstract

A continuous variable valve timing apparatus may include a camshaft, a cam device on which a cam is formed respectively and of which the camshaft is inserted thereto, wherein a relative phase angle with respect to the camshaft is variable, an inside bracket configured to transmit rotation of the camshaft to the cam device, a lifter in which the inside bracket is rotatably inserted therein and on which a cylinder opening and a shaft opening are formed thereon, a control shaft parallel to the camshaft and to which a control rod, inserted into the shaft opening, is eccentrically formed, a control cylinder on which a control rod opening where the control rod is inserted therein is formed and inserted into the cylinder opening, a guide portion guiding movement of the lifter and a controller selectively rotating the control shaft, wherein the lifter may move.

What is claimed is: 
     
       1. A continuous variable valve timing apparatus comprising:
 a camshaft; 
 a cam device on which a cam is formed respectively and of which the camshaft is inserted thereto, wherein a relative phase angle with respect to the camshaft is variable; 
 an inside bracket configured to transmit rotation of the camshaft to the cam device; 
 a lifter in which the inside bracket is rotatably inserted therein and on which a cylinder opening and a shaft opening are formed thereon; 
 a control shaft parallel to the camshaft and to which a control rod, inserted into the shaft opening, is eccentrically formed; 
 a control cylinder on which a control rod opening where the control rod is inserted therein is formed and inserted into the cylinder opening; 
 a guide portion guiding movement of the lifter; and 
 a controller selectively rotating the control shaft, wherein the lifter is configured to move, 
 wherein first and second sliding openings are formed at the inside bracket, 
 wherein a slider pin connected to the camshaft is rotatably inserted into the first sliding opening, 
 wherein cam key is formed at the cam device, and 
 wherein a cam key pin is rotatably inserted into the second sliding opening, wherein a cam key opening is formed on the cam key pin, and the cam key is slidably inserted into the cam key opening. 
 
     
     
       2. The continuously variable valve timing apparatus of  claim 1 , wherein the lifter includes:
 a lifter body in which the inside bracket is rotatably inserted therein; and 
 a lifter head on which a guide opening is formed thereto and connected with the lifter body. 
 
     
     
       3. The continuously variable valve timing apparatus of  claim 2 , wherein the guide portion includes:
 a guide bar inserted into the guide opening; and 
 a guide bracket supporting the guide bar. 
 
     
     
       4. The continuously variable valve timing apparatus of  claim 1 , wherein the slider pin includes:
 a pin body slidably inserted into the camshaft; and 
 a pin head rotatably inserted into the first sliding opening, 
 wherein the pin body and the pin head are integrally or monolithically formed. 
 
     
     
       5. The continuously variable valve timing apparatus of  claim 4 , wherein
 a camshaft oil opening is formed in the camshaft along a longitudinal direction thereof, 
 a body oil opening is formed in the pin body and configured to fluidically-communicate with the camshaft oil opening and 
 an oil groove is formed in the pin head and configured to fluidically-communicate with the body oil opening. 
 
     
     
       6. The continuously variable valve timing apparatus of  claim 1 , wherein the cam device includes a first cam portion disposed corresponding to a first cylinder and a second cam portion disposed corresponding to a second cylinder adjacent to the first cylinder, and
 the inside bracket includes first and second inside brackets configured to transmit rotation of the camshaft to the first and second cam portions respectively. 
 
     
     
       7. The continuously variable valve timing apparatus of  claim 6 , further including a bearing disposed within the lifter and supports the first and second inside brackets. 
     
     
       8. The continuously variable valve timing apparatus of  claim 6 , wherein the first inside bracket and the second inside bracket are connected to each other. 
     
     
       9. The continuously variable valve timing apparatus of  claim 6 , wherein
 the cam is formed on the first cam portion and the second cam portion as a pair, 
 a cam cap connecting portion is formed between the paired cams of each of the first and second cam portions, and 
 a cam supporting portion configured to rotatably support the cam cap connecting portion is formed on the cam cap. 
 
     
     
       10. The continuously variable valve timing apparatus of  claim 9 , wherein a shaft opening in which the control shaft is inserted is formed in the cam cap. 
     
     
       11. The continuously variable valve timing apparatus of  claim 10 , further including a shaft bearing inserted into the shaft opening and rotatably supporting the control shaft. 
     
     
       12. An engine provided with the continuously variable valve timing apparatus of  claim 1 . 
     
     
       13. The engine of  claim 12 , wherein
 the cam device includes a first cam portion disposed corresponding to a first cylinder and a second cam portion disposed corresponding to a second cylinder adjacent the first cylinder, and 
 the inside bracket includes first and second inside brackets configured to transmit rotation of the camshaft to the first and second cam portions respectively and the first and second inside brackets are disposed to the lifter. 
 
     
     
       14. The engine of  claim 13 , wherein the first inside bracket and the second inside bracket are connected to each other. 
     
     
       15. The engine of  claim 12 , wherein the lifter includes:
 a lifter body in which the inside bracket is rotatably inserted therein; and 
 a lifter head on which a guide opening is formed thereto and connected with the lifter body. 
 
     
     
       16. The engine of  claim 15 , wherein the guide portion includes:
 a guide bar inserted into the guide opening; and 
 a guide bracket supporting the guide bar. 
 
     
     
       17. The engine of  claim 12 , wherein
 wherein the slider pin comprise:
 a pin body slidably inserted into the camshaft; and 
 a pin head rotatably inserted into the first sliding opening, 
 wherein the pin body and the pin head are integrally or monolithically formed. 
 
 
     
     
       18. The engine of  claim 17 , wherein
 a camshaft oil opening is formed in the camshaft along a longitudinal direction thereof, 
 a body oil opening is formed in the pin body and configured to fluidically-communicate with the camshaft oil opening and 
 an oil groove is formed in the pin head and configured to fluidically-communicate with the body oil opening. 
 
     
     
       19. The engine of  claim 13 , wherein
 the cam is formed on the first cam portion and the second cam portion as a pair, and 
 a cam cap connecting portion is formed between the paired cams of each of the first and second cam portions, and 
 a cam supporting portion configured to rotatably support the cam cap connecting portion is formed on the cam cap.